3 papers
math.FA2026
Von Neumann-Jordan Constants in Banach Tensor Products
Wenwen Zhang, Ying Xu, Qi Liu +1
We investigate the von Neumann--Jordan constant of Banach tensor products equipped with the injective and projective tensor norms. We first establish lower estimates in terms of th…
math.FA2026
Further Results on the Isometric Embeddability of \(S_q^m\) into \(S_p^n\)
Ying Xu, Wenwen Zhang, Qi Liu
We study Schatten embeddings through circular means of trace powers. In finite dimensions, a decomposition by singular-value vanishing orders shows that every term of order at most…
math.FA2026
James-type constants for Birkhoff--James orthogonality and approximate isosceles
Zhiyao Fang, Ying Xu, Qi Liu +2
We introduce two James-type constants associated with approximate isosceles and approximate Birkhoff--James orthogonality in real normed spaces. The isosceles family coincides with…